VirtueMart customfields on checkout

[rogy]

I have differet customfields on my page VM 2.6.6:
http://www.digiart.ch/index.php/kuenstler/lorenz-a.-fischer/1294-detail

If i will order one size, it will show in the card the other variants
"ART-CANVAS Grösse wählen"
"ART-BONDLUX Grösse wählen"
"ART-PLEX Grösse wählen"

How can i hide the "customfields" if there is "Grösse wählen".

I found the php File default_pricelist.php

on Line 139
<?php echo JHTML::link($prow->url, $prow->product_name).$prow->customfields; ?>